New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

refutation unsoundness on a QF_NIA formula #6690

Closed

zhendongsu opened this issue Apr 14, 2023 · 1 comment

zhendongsu commented Apr 14, 2023

Commit: 6249078
OS: Ubuntu 18.04

[605] % z3release small.smt2
unsat
sat
[606] % cat small.smt2
(declare-fun a () Int)
(assert (distinct a 0 (div (rem (div a a) a) a)))
(check-sat)

(reset)

(define-fun a () Int (- 2))
(assert (distinct a 0 (div (rem (div a a) a) a)))
(check-sat)

The text was updated successfully, but these errors were encountered:

Author

zhendongsu commented Apr 14, 2023

Another related instance:

[520] % z3release small.smt2
unsat
sat
[521] % cat small.smt2
(declare-fun a () Int)
(assert (< (* (rem 1 a)) 0))
(assert (< a 0))
(check-sat)

(reset)

(define-fun a () Int (- 2))
(assert (< (* (rem 1 a)) 0))
(assert (< a 0))
(check-sat)

NikolajBjorner closed this as completed in

b75d81f

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment